<!doctype html> 
<html> 
<head> 
    <meta charset="utf-8"> 
    <title></title> 
</head>
<body>
<script type="text/javascript">
	
json = {'a':10,'b':function(){
	//alert(this.a);
	this.a = 20;

}};
json.b();
alert(json.a);



</script>
</body>
</html>